Roller skate



FIG. 1 is a left side perspective of a roller skate embodying our new design;

FIG. 2 is a left side plan view thereof;

FIG. 3 is a right side plan view thereof;

FIG. 4 is a front plan view thereof;

FIG. 5 is a rear plan view thereof;

FIG. 6 is a top side plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of the elements on the underside of the skate in FIGS. 1, 2, 3 and 7 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a roller skate, as shown and described. 